Tag Archives: raspberry pi

Raspberry PI RF433 transmitter shield

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A lot of you are coming to my blog for RF433 with Raspberry PI content (here). This article is a small part of a larger project I have. As part of this project I built a Raspberry Pi shield including an RF433 emitter and receiver. I could sell this shield to some of view if it make interest to you. To make it I selected emitters and receivers to get the best quality / price compromise.  (read my other articles on this topic) I could sell it around 60€ + port.

Update : chek this article for all informations on the shield and buy it !

RF433 shield for Raspberry PI

RF433 shield for Raspberry PI v0.1

 

 

 

 

 

 

 

 

 

 

 

My question to you is : would you be interested in a such thing ?

If yes : leave me a comment with your email address ( I’ll will remove this address before validating it )

RF433 Raspberry PI shield v1.0

RF433 Raspberry PI shield v1.0

 

Here is the Version 1.0 with antenna connector integrated to PCB.

Make you own PCB

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I recently created a printed circuit board for a raspberry PI design i’m working on. By the past, when I did such things, the cost to make it was not accessible for a home made design. In 10 years things have change a lot and now, you can do it for less than 100€ for a 10×10 two layer board. 4 layer is also something accessible.

I want to share with you this experience, because, I had a good and an bad experience to share.

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Oregon Scientific sensors with Raspberry PI

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After mixing different source of information, I was able to decode some Oregon Scientific sensors to get Temperature and Humidity indication, over the air, on 433.92MHz, with a Raspberry PI system. This article gives some details of this adventure …

You follow this implementation at your own risk…

If you are interrested in this article, you could also take a look here where you can find a RF433 shield and the associated code

 

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RF433 – different transmitters test

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After having test some receiver, naturally, I’ve tested some transmitters, the objective is the same : get the best coverage in the same condition : I would say poor conditions. Lots of wires going every where and an antenna make with a simple 17.3cm wire. As expected, results vary regarding the emitter used. Reed more to get details.

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MQTT on Raspeberry PI

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MQTT (MQ Telemetry Transport) is a Message Queuing system for machine to machine communications. It allows communication of mobile systems over high latency, low bandwidth and poor quality networks. It manage communications over TCP (not over Http) to optimize the size of messages and it manages different quality of services. Depending of it, messages can be dropped, received multiple times of you can have the insurance to receive the message one and only one time.

It makes this protocol really interesting for the communication between a raspberry PI and a server when this communication is event driven and the communication link looks like a Edge/3G channel.

Mosquitto is an open source implementation for MQTT.

Here are some tips on how I implemented it, for a demonstration purpose

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Raspberry PI – receive 433Mhz radio signal

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Tonight, the hack objective is to communicate with 433Mhz equipments using Raspberry PI. For this, I use a 433Mhz receiver from Itead Studio bought at hack spark for 4.5€ with an emitter. Cabling is simple : VDD on 5V (I tryed to use 3.3V supply voltage but as a consequence the reception range is limited to a couple of cm) , GND goes to GND and One of the data pin going to pin 13 (gpio21/27). This is following elements found on that site : ninjablocks

If you are looking for a RF433 shield for Raspberry, check this link to another article !

The first step is to install a fresh wheezy raspbian environment and get the basis element to work :

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Raspberry PI – GPIO and temperature sensor

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Some new hacking on Raspberry PI, the objective is to get a TC74A5 3.3VAT temperature sensor working with a RPI. This sensor is a digital sensor type 2 wires I2C operating at 3.3V with a precision of 2°C.

Read next to get details

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Raspberry PI – wan emulation

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piwan.org

piwan.org

PIWan project : Here is a new, quick & dirty project to be done with a raspberry PI : At work we currently have to simulate our application for a worldwide usage. We have really great tools for that but they need expertise and specific campaigns. The purpose of this document is to describe a RPI based solution with two Ethernet cards and some clever command lines to simulate a wan network for developers. The advantage of this solution will be to cost less than 100euros and will be easy to use with the right documentation.

See next pages for implementation details:

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